Mophie juice pack air

Size comparison with "naked" iPhone 3G. As you can see, it does add quite a bit of bulk to the iPhone, but AFAIK, it's the least bulky of all the battery cases available now. I don't mind the added bulk; it makes the phone easier to hold onto without worrying it'll slip out of my hand, IMO. And while it does feel bulky in a pocket, I am fine with it in the back pocket of my jeans.

The hubby doesn't really like the extra bulk since he carries his iPhone in his front jeans pocket. He also likes the rubber case that he's using now because it has a much grippier surface which he says makes it less likely to slip out of a jacket pocket or out of his hand, so at the moment the Juice Pack Air is not for him.